Modeling wave propagation in damped waveguides of arbitrary cross-section

被引：2
|
作者：
Bartoli, Ivan [1 ]
Marzani, Alessandro [2 ]
Matt, Howard [1 ]
di Scalea, Francesco Lanza [1 ]
Viola, Erasmo [2 ]
机构：
[1] Univ Calif San Diego, Dept Struct Engn, NDE & Struct Hlth Monitoring Lab, 9500 Gilman Dr,MC 0085, La Jolla, CA 92093 USA
[2] Univ Bologna, DISTART, I-40136 Bologna, Italy
来源：
HEALTH MONITORING AND SMART NONDESTRUCTIVE EVALUATION OF STRUCTURAL AND BIOLOGICAL SYSTEMS V | 2006年 / 6177卷
基金：
美国国家科学基金会;
关键词：
Semi-Analytical Finite Element method; linear viscoelasticity; material damping; guided wave attenuation; energy velocity;
D O I：
10.1117/12.640032
中图分类号：
R318 [生物医学工程];
学科分类号：
0831 ;
摘要：
In this paper the Semi-Analytical Finite Element (SAFE) method for modeling guided wave propagation is extended to account for linear viscoelastic material damping. Linear viscoelasticity is introduced by allowing for complex stiffness constitutive matrices for the material. Dispersive characteristics of viscoelastic waveguides, such as phase velocity, attenuation, energy velocity and cross-sectional wavestructures are extracted. Knowledge of the above-mentioned dispersive properties is important in any structural health monitoring attempt that uses ultrasonic guided waves for long range inspection. The proposed damped formulation is applied to several waveguides with different mechanical and geometric properties. In particular, a viscoelastic isotropic plate, a railroad track and a pipe are studied.
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页数：12
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